The 'missing' supports have already been mentioned in the last couple of updates, the ground work is not finished in centre of the site. Presumably for access reasons as the sides are built up or there is something else coming there such as another attraction perhaps underneath the track? (probably not the latter but I'm holding out hope there will be something else)
Update from today
A few of new supports have been erected along the back of the site next to Maus au Chocolat. A starts of a concrete wall around the gap left for the lifthill there can also be seen. I'm assuming when the lifthill is erected this wall will continue up and enclose it maybe?
Scaffolding has been erected against this facade wall running towards the gate at Maus for theming work to begin.
One corner of this building has received its roof. Its not a very good picture but the slates on the roof are identical to those seen on other buildings in the Berlin area.
Extending Tobi's drawing from Phantasiastisch's post above I attempted to have roughly drawn out on Microsoft Paint (I'm no Tobi...) an overview of the currently installed track - plus the predicted curve and lifthill. Grey marks underground track.
The overall scale, dimensions and shaping are probably not very accurate at all but it does the job. It doesn't seem like much when reduced to that but there is in reality a lot there.
In fact Tobi on PhantaFriends.de has roughly calculated that there are currently about 565 metres of track installed - taking into the account the station, break run, launch and the 35 other track parts.
Obviously we don't know how long F.L.Y. will be. And by how much will they surpass the current record holder for longest flying coaster (Flying Dinosaur at 1,124 metres)?
If they are only beating it by a small margin then it is possible that around about or nearly half of F.L.Y. is currently standing.